Can we report people for calling themselves challenger and then dying 13 times.

In a low sliver game like honestly i feel like its very disrespectful to the higher elo players who actually achieved challenger because any challenger dying that amount of times in a SLIVER game should be ashamed, embarrassed or simply not challenger at all. This guy legit told us in lobby to report him if he didn't carry us and claimed to be Korean challenger. Then he picks and goes jungle. Its one thing to call yourself a smurf and feed but this ? Thank god i had a brain and managed to end the game. From the champion select to the game i was already shaking my head. Its not acceptable to lie about something like that and give your team a false hope only to feed its tilting af.